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Topic Review (Newest First)

08-26-2010 03:06 PM

Dirty Biker

yeah I dloaded a trial version of performance trends engine analyzer pror v3.9. It's fully functional for ten days, I am starting to figure it out I think sorta. Maybe. It is pretty cool, I wish I could just tell it what rpm I want the torque peak and it magically come up with the perfect cam. It still says I need a bigger carb even with 750 cfm quadrajet and stock gm dual plane manifold and fuelie heads. I am prolly doing something wrong. Good news is the 283 motor I made on it burns half as many lbs per hour gas as the stock 454 model I tried for comparison so that is encouraging. It also of course makes less power, but more than half as much, but uses less than half as much gas. If that makes any sense I dunno. If I set the cam profile and heads and intake and huge carb etc to make peak tourqe @4100 rpms with the 454 it burns even more gas. Thirsty big ole bastard...

08-26-2010 10:55 AM

cobalt327

Quote:

Originally Posted by Dirty Biker

DYNOSIM REQUIRED DATA....
Bore 4"
Stroke 3"
Rod Length 6.25"
Cylinder head flow, intake and exhaust 0.100" through 0.700" or whatever the mfg gives for range I don't Know what this means. Can somebody help? I would use stock single hump chevy heads at first then maybe try 1996 and up vortecs. There is 062 heads for sale now for 150$ on cl
Intake valve diameter 1.94
Exhaust valve diameter 1.5
Static compression ratio 10:1
CFM, type of induction (2-bbl, 4-bbl, TBI, TPI) 400 cfm, I think. I have the two barrel carb and the single barrel fish carb. I think they are both about 400 cfm, maybe a little more. I don't know if the motor would ever breath enough even at high rpm to need a quadrajet.
Intake manifold type: Dual plane stock two barrel manifold, I also have a dual plane four barrel manifold from a 350 and a quadrajet, might try it both ways to see if it makes any difference
Exhaust system: small diameter long tube headers, single exhaust pipe and no muffler say 1.5 inch primaries and 30" length
CompCams 12-300-4 [49] There may be a better cam, I didn't call them.

Thanks Alot!

TI stopped by here yesterday, but made no posts. Sooo, might be better to look for an alternative, as I know you are.

I had a similar experience with Dyno 2000. I still rely on it. Generally it very close to the actual results of a build.
I Googled it after I ask the question and found that there are thousands of free cam file downloads online now which was my only complaint with it. Now I can load it up with specifics and get closer. Discovered it 5 years back from some of my contacts at Speed. Then there were several Crew Chiefs secretly using it. No well kept secrets in the break room. You might be able to download it like freeware now. It was expensive years back.

However I doubt it will indicate that a big bore small stroke will be efficient in a big truck.

08-25-2010 08:52 PM

ericnova72

Quote:

Originally Posted by Duntov

Do you have an opinion on the old Dyno 2000 software? I don't even know if there has been an upgrade to that. I've been using it a long time.

No, never have used it. I have the Performance Trends, but it is a few update versions out of date. The newer ones are just easier to use than my old version, but I am familiar with what I have and haven't upgraded. It did teach me a whole lot when I first got it, I played with it all the time to get familiar with it.

08-25-2010 07:57 PM

Duntov

Quote:

Originally Posted by ericnova72

Camquest is just a toy program, ok for comparing cams for power trends, but don't put much stock in actual hp figures it gives you. After all, it is a marketing tool for Comp Cams, to get you to buy their cams. I have it but only use it to compare power curves between a group of cams I think will fit the bill for an engine I'm spec'ing out at the time.

Do you have an opinion on the old Dyno 2000 software? I don't even know if there has been an upgrade to that. I've been using it a long time.

08-25-2010 07:42 PM

ericnova72

Camquest is just a toy program, ok for comparing cams for power trends, but don't put much stock in actual hp figures it gives you. After all, it is a marketing tool for Comp Cams, to get you to buy their cams. I have it but only use it to compare power curves between a group of cams I think will fit the bill for an engine I'm spec'ing out at the time.

It's not even close to a true dedicated dyno program like DynoSim or Performance Trends Engine Analyzer. It is way to simplistic about manifolds, heads, and exhaust...just off the top of my head.

08-25-2010 05:30 PM

Dirty Biker

according to camquest6, you pick up 50 ft/lb more torque with vortec manifold on a stock 283 on any cam. That is amazing, 400+ ft/lb with a 283 at 2000 rpms? It must be wrong tho.

08-25-2010 04:17 PM

Dirty Biker

Man turbolover I thought that 240h grind was the mildest torque cam they had, Which one do you think might be better? Oh maybe you were thinking the stock chevy 302 cam that I just posted? Yeah I agree that would be the bad for mpg for sure but just to compare the two could be useful.

what about that guy trying to use the saab turboes on his ride? There is a saab turbo car at the u pull it here in Louisville, the turbo was off already even. i was checking it out thinking the same thing when I read that guys post. How do you use only one big turbo on a v8? I know people do it but it kinda makes more sense to use one small one on each bank, maybe on some super shorty block hugger headers or something.

08-25-2010 03:20 PM

turbolover

I found that out the hard way as well. And always wear a breathing mask when you pull out the cartridge rolls, otherwise you'll be blowing out cast iron boogers for about a week- can't be good for your lungs.

BTW you need to think of a cam with much smaller seat duration if your after mpg's and you can't run that high of compression in that engine with that HUGE load. Otherwise it'll sound like a can of rocks- until you blow a piston.

08-25-2010 03:15 PM

Dirty Biker

The comp can part number for the factory muscle cam that is sposta be the same as the original 302 solid lifter cam is #12-107-3, It would be good to compare it to the rv cam in the desktop dyno if I could.

I learned that eye glasses or sun glasses are not the same thing as safety glasses, stuff still gets in there. I once went to the doctor and he asked me if I do alot of welding and grinding and stuff, I said "Yeah why?" he said "Your contact lenses have metal shavings in them, they may have saved your eyesite." So yeah, wear the dumbest looking safety glasses you can.

08-25-2010 12:07 PM

adantessr

Quote:

Originally Posted by Dirty Biker

This is me me having a great day however a piece of metal from the grinder had just got in my eye and I was mad about it a little bit. I later used a big magnet to get it out. Maybe dragging a magnet across my eye was a bad idea, but it sure felt better right away. I tend to over simplify apparently.

I have also used a magnet to get steel out of my eye , but I didn't drag it across my eye . I decided I'd rather use safety glasses than a magnet after that though .

08-25-2010 11:59 AM

Dirty Biker

Quote:

Originally Posted by cobalt327

If you want an accurate estimate, techinspector1 has said the following is needed:

DYNOSIM REQUIRED DATA....
Bore 4"
Stroke 3"
Rod Length 6.25"
Cylinder head flow, intake and exhaust 0.100" through 0.700" or whatever the mfg gives for range I don't Know what this means. Can somebody help? I would use stock single hump chevy heads at first then maybe try 1996 and up vortecs. There is 062 heads for sale now for 150$ on cl
Intake valve diameter 1.94
Exhaust valve diameter 1.5
Static compression ratio 10:1
CFM, type of induction (2-bbl, 4-bbl, TBI, TPI) 400 cfm, I think. I have the two barrel carb and the single barrel fish carb. I think they are both about 400 cfm, maybe a little more. I don't know if the motor would ever breath enough even at high rpm to need a quadrajet.
Intake manifold type: Dual plane stock two barrel manifold, I also have a dual plane four barrel manifold from a 350 and a quadrajet, might try it both ways to see if it makes any difference
Exhaust system: small diameter long tube headers, single exhaust pipe and no muffler say 1.5 inch primaries and 30" length
CompCams 12-300-4 [49] There may be a better cam, I didn't call them.

Thanks Alot!

08-25-2010 06:20 AM

cobalt327

Quote:

Originally Posted by Dirty Biker

Would somebody desktop dyno this for me?

If you want an accurate estimate, techinspector1 has said the following is needed: